XML 71 R54.htm IDEA: XBRL DOCUMENT v3.19.2
Reconciliation of Federal Statutory Income Tax (Detail)
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Schedule Of Income Taxes [Line Items]      
Income tax provision at statutory rate: 21.00% 28.60% 34.00%
Rate Change   (34.80%)  
Loss on debt extinguishment (0.50%)    
Derivative gain/loss 0.60% 1.00% 2.80%
Valuation allowance release from Asset Acquisition 4.80%    
Non-deductible debt issuance costs   (0.20%)  
Non-deductible interest on conversion (0.30%) (0.10%)  
Inducement charge (0.10%) (2.00%) (1.00%)
Other   (1.10%)  
Miscellaneous   (0.10%) (0.10%)
Current year credits generated   4.40%  
Credit carry forward generated (released) (3.80%) 4.10%  
Valuation allowance (16.90%) 0.30% (35.70%)
Total 4.80% 0.00% 0.00%